Her mother could have fed her so many lies over the years. Not saying she did, but I've often heard that from children estranged from parents that the one at home blamed the one who left for everything!
She could have grown up thinking her dad walked out on her, when in reality he left the wife for whatever reason, or she left him!
The mothers family could have had their say, too, as often happens.
Maybe she would just like a one on one to see how she's received, and she may become friendly to you after awhile!
But, I get the impression that YOU'RE going to be the problem not her and I'm sorry if I'm wrong.
Give the lass a chance, if not for her then for your husband who must have missed her so much over the years!!!